Craze-resistant polymodal linear block copolymers with resinous

Details Craze-resistant polymodal linear block copolymers with resinous Craze-resistant polymodal linear block copolymers with resinous

1986-03-24

1987-11-03

Briggs, Jr., Wilbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525271, 525314, 206471, C08F29704, C08F29300

Patent

active

047044357

ABSTRACT:
Sequential charging of initiator and monomers in a multistage solution polymerization process involving conjugated diene and monovinylaromatic monomers wherein the initial and final charges are monovinylaromatic monomer results in the production of polymodal linear block copolymers with terminal resinous blocks. A typical 6-stage charge sequence is as follows: stage 1: (S.sub.i); stage 2: (S.sub.i); stage 3: (B); stage 4: (S.sub.i); stage 5: (B) and stage 6: (S) wherein (S.sub.i) is monovinylaromatic monomer and initiator, (B) is conjugated diene monomer and (S) is monovinylaromatic monomer. At each stage, polymerization is allowed to continue until no free monomer is present.
The polymodal block copolymer products comprise high, medium and low molecular weight species designated, respectively, as S.sub.1 -S.sub.2 -B.sub.1 -S.sub.3 -B.sub.2 -S.sub.4 ; S.sub.2 -B.sub.1 -S.sub.3 -B.sub.2 -S.sub.4 ; and S.sub.3 -B.sub.2 -S.sub.4 wherein S.sub.1, S.sub.2, S.sub.3 and S.sub.4 represent, respectively, polyvinylaromatic blocks resulting from polymerization of the first, second, third and fourth charges of monovinylaromatc monomer (stages 1,2,4 and 6); B.sub.1 represents a polydiene block resulting from polymerization of the first charge of conjugated diene monomer (stage 3); and B.sub.2 represents a polydiene block resulting from polymerization of the second charge of conjugated diene monomer (stage 5).
The subject copolymers can be fabricated into sheets and molded objects possessing little color, a high degree of transparency and excellent impact resistance. These fabricated products do not craze on being impacted.

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